Test the failures, not only the success
The short version: teams do not fail here because they lack effort. They fail because nobody wrote down which decision belongs to whom.
- Run a declined card, a timed-out payment, and a refund before going live.
- Check the confirmation email arrives after a successful payment and not before.
- Confirm the order status updates when the webhook fails and is retried.
If you want a second opinion on where yours sits, we run a short audit and send back a one-page summary with the three changes worth making first.